If you are starting from a rough casting or pitted corroded surface, our abrasive kit will give a smooth bright finish. Kit contains 8 pieces and instructions. APPLICATION:   pre-polish Aluminum Alloys, Brass, Copper, Steel, Iron and Stainless Steel This abrasive kit contains : - 3 off 4\"  x 1\"  colour stitch mop - 450g Tube 80 coarse grit abrasive compound - 450g Tube 150 or 180 medium grit abrasive compound - 450g Tube 240 or 300 fine grit abrasive compound - Steel Arbor - Dust Mask